It's not the first time it's happened, but you find yourself nude and unconscious in the Rocky Mountains. After you are aroused and fully erect (You know, awake and standing) you stumble around a bit and find an emergency cabin fully stocked with all sorts of wonderful food and drink, and a bunch of .375 H&H rifles with plenty of ammo. Outside, a big brown bear is just standing there. You know that while food and water is no issue, you'll freeze to death if you don't borrow that bear's fur coat for a few weeks. You have no need or intention of eating any part of the bear. Do you kill it or abide by your principles and freeze?
Meanwhile, a few thousand miles away, your identical twin brother is fully clothed, Filson, and leaning against the hood of his 4x4 Jimmy. He has a juicy deer in the sights of his new .300 Win Mag he bought at Cabela's last week. Twelve minutes away is a WalMart SuperCenter with rows of (reputedly) fresh fruit, vegetables, and meats. Hell, there's even a McDonald's built into the front of the store. It would be easier and far less costly to eat a Big Mac. Is it ethical for him to shoot the deer when his survival in no way depends on doing so?